add biometricsEnabled to VaultSettings type

@@ -103,6 +103,12 @@103103    */104104   reduceMotion?: boolean;105105   /**106+   * Android-only: when true, the master key is escrowed in AndroidKeyStore107+   * and the lock screen offers biometric unlock. Toggled from Settings →108+   * Security → Biometrics. Has no effect on desktop builds.109+   */110+  biometricsEnabled?: boolean;111+  /**106112    * User overrides for keyboard shortcuts. Keys are ShortcutAction names107113    * (see src/shared/shortcuts.ts). Missing actions fall through to108114    * DEFAULT_BINDINGS — `getActiveBindings(settings.shortcuts)` is the